tier:delete the linkfile if data file creation fails

If we are creating data file in a hot subvolume
then we will create a linkfile in cold subvolume.
Linkfile creation happens first. If linkfile creation
was successful and data file creation failed, then
linkfile in cold subvolume will become stale.

This patch will delete the linkfile as well, if data
file creation fails.

Also this code duplicates dht_create to make tier_create

Change-Id: I377a90dad47f288e9576c7323b23cf694a91a7a3
BUG: 1290677
Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com>
Reviewed-on: http://review.gluster.org/12948
Reviewed-by: N Balachandran <nbalacha@redhat.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-by: Dan Lambright <dlambrig@redhat.com>
Tested-by: Dan Lambright <dlambrig@redhat.com>

4 files changed, 288 insertions, 82 deletions

diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index 39da4323d8e..eb7ca32632a 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -6038,82 +6038,6 @@ err:
         return 0;
 }
 
-gf_boolean_t
-dht_is_hot_tier_decommissioned (xlator_t *this)
-{
-        dht_conf_t              *conf        = NULL;
-        xlator_t                *hot_tier    = NULL;
-        int                      i           = 0;
-
-        conf = this->private;
-        hot_tier = conf->subvolumes[1];
-
-        if (conf->decommission_subvols_cnt) {
-                for (i = 0; i < conf->subvolume_cnt; i++) {
-                        if (conf->decommissioned_bricks[i] &&
-                                conf->decommissioned_bricks[i] == hot_tier)
-                                return _gf_true;
-                }
-        }
-
-        return _gf_false;
-}
-
-int
-dht_create_tier_wind_to_avail_subvol (call_frame_t *frame, xlator_t *this,
-                                      xlator_t *subvol, loc_t *loc, int32_t flags,
-                                      mode_t mode, mode_t umask, fd_t *fd,
-                                      dict_t *params)
-{
-        xlator_t                *hot_subvol  = NULL;
-        xlator_t                *cold_subvol = NULL;
-        dht_conf_t              *conf        = NULL;
-        dht_local_t             *local       = NULL;
-
-        local = frame->local;
-
-        conf = this->private;
-
-        cold_subvol = subvol;
-        hot_subvol = conf->subvolumes[1];
-        if (conf->subvolumes[0] != cold_subvol) {
-                hot_subvol = conf->subvolumes[0];
-        }
-        /*
-         * if hot tier full, write to cold.
-         * Also if hot tier is full, create in cold
-         */
-        if (dht_is_subvol_filled (this, hot_subvol) ||
-            dht_is_hot_tier_decommissioned (this)) {
-                gf_msg_debug (this->name, 0,
-                              "creating %s on %s", loc->path,
-                              cold_subvol->name);
-
-                STACK_WIND (frame, dht_create_cbk,
-                            cold_subvol, cold_subvol->fops->create,
-                            loc, flags, mode, umask, fd, params);
-        } else {
-                local->params = dict_ref (params);
-                local->flags = flags;
-                local->mode = mode;
-                local->umask = umask;
-                local->cached_subvol = hot_subvol;
-                local->hashed_subvol = cold_subvol;
-
-                gf_msg_debug (this->name, 0,
-                              "creating %s on %s (link at %s)", loc->path,
-                              hot_subvol->name, cold_subvol->name);
-
-                dht_linkfile_create (frame, dht_create_linkfile_create_cbk,
-                                     this, hot_subvol, cold_subvol, loc);
-
-                goto out;
-        }
-out:
-        return 0;
-}
-
-
 int
 dht_create_wind_to_avail_subvol (call_frame_t *frame, xlator_t *this,
                                  xlator_t *subvol, loc_t *loc, int32_t flags,
@@ -6125,11 +6049,6 @@ dht_create_wind_to_avail_subvol (call_frame_t *frame, xlator_t *this,
 
         local = frame->local;
 
-        if (strcmp (this->type, "cluster/tier") == 0)
-                return dht_create_tier_wind_to_avail_subvol(frame, this, subvol,
-                                                            loc, flags, mode,
-                                                            umask, fd, params);
-
         if (!dht_is_subvol_filled (this, subvol)) {
                 gf_msg_debug (this->name, 0,
                               "creating %s on %s", loc->path,
diff --git a/xlators/cluster/dht/src/tier-common.c b/xlators/cluster/dht/src/tier-common.c
index 19ed224c58c..40c8c9e965d 100644
--- a/xlators/cluster/dht/src/tier-common.c
+++ b/xlators/cluster/dht/src/tier-common.c
@@ -17,6 +17,267 @@
 #include "tier.h"
 
 int
+tier_create_unlink_stale_linkto_cbk (call_frame_t *frame, void *cookie,
+                                     xlator_t *this, int op_ret, int op_errno,
+                                     struct iatt *preparent,
+                                     struct iatt *postparent, dict_t *xdata)
+{
+
+        dht_local_t     *local = NULL;
+
+        local = frame->local;
+
+        if (local->params) {
+                dict_del (local->params, GLUSTERFS_INTERNAL_FOP_KEY);
+        }
+
+        DHT_STACK_UNWIND (create, frame, -1, local->op_errno,
+                          NULL, NULL, NULL, NULL, NULL, NULL);
+
+        return 0;
+}
+
+int
+tier_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int op_ret, int op_errno,
+                 fd_t *fd, inode_t *inode, struct iatt *stbuf,
+                 struct iatt *preparent, struct iatt *postparent, dict_t *xdata)
+{
+        call_frame_t *prev           = NULL;
+        int           ret            = -1;
+        dht_local_t  *local          = NULL;
+        xlator_t     *hashed_subvol  = NULL;
+        dht_conf_t   *conf           = NULL;
+
+        local = frame->local;
+        conf  = this->private;
+
+        hashed_subvol = TIER_HASHED_SUBVOL;
+
+        if (!local) {
+                op_ret = -1;
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        if (op_ret == -1) {
+                if (local->linked == _gf_true) {
+                        local->op_errno = op_errno;
+                        local->op_ret = op_ret;
+                        ret = dht_fill_dict_to_avoid_unlink_of_migrating_file
+                              (local->params);
+                        if (ret) {
+                                gf_msg (this->name, GF_LOG_WARNING, 0,
+                                        DHT_MSG_DICT_SET_FAILED,
+                                        "Failed to set dictionary value to "
+                                        "unlink of migrating file");
+                                goto out;
+                        }
+
+                        STACK_WIND (frame,
+                                    tier_create_unlink_stale_linkto_cbk,
+                                    hashed_subvol,
+                                    hashed_subvol->fops->unlink,
+                                    &local->loc, 0, local->params);
+                        return 0;
+                }
+                goto out;
+        }
+
+        prev = cookie;
+
+        if (local->loc.parent) {
+                dht_inode_ctx_time_update (local->loc.parent, this,
+                                           preparent, 0);
+
+                dht_inode_ctx_time_update (local->loc.parent, this,
+                                           postparent, 1);
+        }
+
+        ret = dht_layout_preset (this, prev->this, inode);
+        if (ret != 0) {
+                gf_msg_debug (this->name, 0,
+                              "could not set preset layout for subvol %s",
+                              prev->this->name);
+                op_ret   = -1;
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        local->op_errno = op_errno;
+
+        if (local->linked == _gf_true) {
+                local->stbuf = *stbuf;
+                dht_linkfile_attr_heal (frame, this);
+        }
+out:
+        if (local->params) {
+                dict_del (local->params, TIER_LINKFILE_GFID);
+        }
+
+        DHT_STRIP_PHASE1_FLAGS (stbuf);
+
+        DHT_STACK_UNWIND (create, frame, op_ret, op_errno, fd, inode,
+                          stbuf, preparent, postparent, xdata);
+
+        return 0;
+}
+
+int
+tier_create_linkfile_create_cbk (call_frame_t *frame, void *cookie,
+                                xlator_t *this,
+                                int32_t op_ret, int32_t op_errno,
+                                inode_t *inode, struct iatt *stbuf,
+                                struct iatt *preparent, struct iatt *postparent,
+                                dict_t *xdata)
+{
+        dht_local_t     *local             = NULL;
+        xlator_t        *cached_subvol     = NULL;
+        dht_conf_t      *conf              = NULL;
+        int              ret               = -1;
+
+        local = frame->local;
+        if (!local) {
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        if (op_ret == -1) {
+                local->op_errno = op_errno;
+                goto err;
+        }
+
+        conf = this->private;
+        if (!conf) {
+                local->op_errno = EINVAL;
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        cached_subvol = TIER_UNHASHED_SUBVOL;
+
+        if (local->params) {
+                dict_del (local->params, conf->link_xattr_name);
+                dict_del (local->params, GLUSTERFS_INTERNAL_FOP_KEY);
+                ret = dict_set_static_bin (local->params, TIER_LINKFILE_GFID,
+                                           stbuf->ia_gfid, 16);
+                if (ret) {
+                        gf_msg (this->name, GF_LOG_WARNING, 0,
+                                DHT_MSG_DICT_SET_FAILED,
+                                "Failed to set dictionary value"
+                                " : key = %s", TIER_LINKFILE_GFID);
+                }
+
+        }
+
+        STACK_WIND (frame, tier_create_cbk,
+                    cached_subvol, cached_subvol->fops->create,
+                    &local->loc, local->flags, local->mode,
+                    local->umask, local->fd, local->params);
+
+        return 0;
+err:
+        DHT_STACK_UNWIND (create, frame, -1, op_errno, NULL, NULL, NULL,
+                          NULL, NULL, NULL);
+        return 0;
+}
+
+gf_boolean_t
+tier_is_hot_tier_decommissioned (xlator_t *this)
+{
+        dht_conf_t              *conf        = NULL;
+        xlator_t                *hot_tier    = NULL;
+        int                      i           = 0;
+
+        conf = this->private;
+        hot_tier = conf->subvolumes[1];
+
+        if (conf->decommission_subvols_cnt) {
+                for (i = 0; i < conf->subvolume_cnt; i++) {
+                        if (conf->decommissioned_bricks[i] &&
+                                conf->decommissioned_bricks[i] == hot_tier)
+                                return _gf_true;
+                }
+        }
+
+        return _gf_false;
+}
+
+int
+tier_create (call_frame_t *frame, xlator_t *this,
+            loc_t *loc, int32_t flags, mode_t mode,
+            mode_t umask, fd_t *fd, dict_t *params)
+{
+        int                     op_errno            = -1;
+        dht_local_t             *local              = NULL;
+        dht_conf_t              *conf               = NULL;
+        xlator_t                *hot_subvol         = NULL;
+        xlator_t                *cold_subvol        = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+
+        conf = this->private;
+
+        dht_get_du_info (frame, this, loc);
+
+        local = dht_local_init (frame, loc, fd, GF_FOP_CREATE);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+
+
+        cold_subvol = TIER_HASHED_SUBVOL;
+        hot_subvol = TIER_UNHASHED_SUBVOL;
+
+        if (conf->subvolumes[0] != cold_subvol) {
+                hot_subvol = conf->subvolumes[0];
+        }
+        /*
+         * if hot tier full, write to cold.
+         * Also if hot tier is full, create in cold
+         */
+        if (dht_is_subvol_filled (this, hot_subvol) ||
+            tier_is_hot_tier_decommissioned (this)) {
+                gf_msg_debug (this->name, 0,
+                              "creating %s on %s", loc->path,
+                              cold_subvol->name);
+
+                STACK_WIND (frame, tier_create_cbk,
+                            cold_subvol, cold_subvol->fops->create,
+                            loc, flags, mode, umask, fd, params);
+        } else {
+                local->params = dict_ref (params);
+                local->flags = flags;
+                local->mode = mode;
+                local->umask = umask;
+                local->cached_subvol = hot_subvol;
+                local->hashed_subvol = cold_subvol;
+
+                gf_msg_debug (this->name, 0,
+                              "creating %s on %s (link at %s)", loc->path,
+                              hot_subvol->name, cold_subvol->name);
+
+                dht_linkfile_create (frame, tier_create_linkfile_create_cbk,
+                                     this, hot_subvol, cold_subvol, loc);
+
+                goto out;
+        }
+out:
+        return 0;
+
+err:
+
+        op_errno = (op_errno == -1) ? errno : op_errno;
+        DHT_STACK_UNWIND (create, frame, -1, op_errno, NULL, NULL, NULL,
+                          NULL, NULL, NULL);
+
+        return 0;
+}
+
+int
 tier_unlink_nonhashed_linkfile_cbk (call_frame_t *frame, void *cookie,
                                     xlator_t *this, int op_ret, int op_errno,
                                     struct iatt *preparent,
diff --git a/xlators/cluster/dht/src/tier-common.h b/xlators/cluster/dht/src/tier-common.h
index 81a0c96411d..17cddcdd3e4 100644
--- a/xlators/cluster/dht/src/tier-common.h
+++ b/xlators/cluster/dht/src/tier-common.h
@@ -11,6 +11,32 @@
 #ifndef _TIER_COMMON_H_
 #define _TIER_COMMON_H_
 /* Function definitions */
+int
+tier_create_unlink_stale_linkto_cbk (call_frame_t *frame, void *cookie,
+                                     xlator_t *this, int op_ret, int op_errno,
+                                     struct iatt *preparent,
+                                     struct iatt *postparent, dict_t *xdata);
+
+int
+tier_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int op_ret, int op_errno,
+                 fd_t *fd, inode_t *inode, struct iatt *stbuf,
+                 struct iatt *preparent, struct iatt *postparent,
+                 dict_t *xdata);
+
+int
+tier_create_linkfile_create_cbk (call_frame_t *frame, void *cookie,
+                                 xlator_t *this,
+                                 int32_t op_ret, int32_t op_errno,
+                                 inode_t *inode, struct iatt *stbuf,
+                                 struct iatt *preparent,
+                                 struct iatt *postparent,
+                                 dict_t *xdata);
+
+int
+tier_create (call_frame_t *frame, xlator_t *this,
+             loc_t *loc, int32_t flags, mode_t mode,
+             mode_t umask, fd_t *fd, dict_t *params);
 
 int32_t
 tier_unlink (call_frame_t *frame, xlator_t *this,
diff --git a/xlators/cluster/dht/src/tier.c b/xlators/cluster/dht/src/tier.c
index 2f415c4dbc2..452b491ffbe 100644
--- a/xlators/cluster/dht/src/tier.c
+++ b/xlators/cluster/dht/src/tier.c
@@ -2020,7 +2020,7 @@ class_methods_t class_methods = {
 struct xlator_fops fops = {
 
         .lookup      = dht_lookup,
-        .create      = dht_create,
+        .create      = tier_create,
         .mknod       = dht_mknod,
 
         .open        = dht_open,